Same here! We need the possibility for a connection via Exchange/Z-Push too. Hope there are ressources to implement this feature in the future 
I like /e/ 
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A question to the /e/ developers. Exchange implementation was part of Android very early, and that implementation is open source (see here: https://android.googlesource.com/platform/packages/apps/Exchange/+/master/src/com/android/exchange).
I am just curious why it is not part of /e/. Is it something that has just not been added (yet) or has it been removed on purpose and for a particular reason?
This code is 6 years old.
Probably abandoned by Google when Microsoft upgraded Exchange
The only way to get an Exchange (O365 or personal) at this time, is to use OWA as PWA.